Where Does The Water Go? Ep:19

Summary

The video showcases the intricacies of building a drainage system, highlighting the unwrapping of wall forms and the meticulous placement of a perforated sewer pipe and crushed basalt. A remote-controlled truck efficiently places materials, demonstrating the advantages of specialized equipment. The Delta drain and filter fabric are crucial for preventing water saturation and soil contamination. Emphasizing structural integrity, the project maintains setbacks and controlled compaction to avoid wall jacking. Finally, all drainage is directed to the storm drain system to adhere to city regulations, ensuring responsible water management.

Takeaways

• 😀 Stripping wall forms is enjoyable, especially on a nice day when everything goes smoothly.
• 😀 The drainage structure includes a four-inch diameter perforated sewer pipe, crucial for managing water.
• 😀 Crushed basalt is used as the second component of the drainage system to prevent clogging and facilitate water movement.
• 😀 Remote-controlled trucks improve efficiency by precisely placing rocks, saving time and labor costs.
• 😀 Delta drain helps manage water flow and prevents saturation of the wall, reducing potential efflorescence.
• 😀 The filter fabric is essential for keeping clay particles from clogging the drainage system.
• 😀 Maintaining a layer of rock against the wall prevents wall jacking caused by expansive soils.
• 😀 The backfill process requires careful compaction to avoid stressing the retaining wall.
• 😀 Engineers emphasize the importance of transporting water to the storm drain to prevent liability for water damage to neighbors.
• 😀 The project adheres to strict city requirements for drainage and water management.

Q & A

What is the initial step after stripping the wall forms?

The initial step is to build the drainage structure, starting with the installation of a perforated sewer pipe.

Why is the perforated pipe laid directly on the footing?

It is laid directly on the footing to capture water efficiently before it gets too deep, as the perforations are positioned at the bottom of the pipe.

What material is used to cover the perforated pipe and why?

Crushed basalt is used because it allows for water to migrate through its spaces without clogging, ensuring effective drainage.

How does the remote-controlled truck enhance the construction process?

The remote-controlled truck allows for precise placement of rock, increasing efficiency and reducing the need for additional manual labor.

What is Delta drain, and why is it used in this project?

Delta drain is a plastic sheet with truncated domes that creates a space for water to flow down without contacting the concrete wall, preventing saturation and efflorescence.

What is the purpose of the filter fabric used in the drainage system?

The filter fabric is designed to prevent clay particles from contaminating the crushed basalt, ensuring that only water can pass through to the drainage pipe.

What is wall jacking, and how is it prevented in this construction?

Wall jacking occurs when expansive soils push against a wall during wet conditions and then shrink, leaving gaps. It is prevented by maintaining a layer of filtered crushed basalt against the wall.

What recommendation did the geotechnical engineer provide regarding the setback from the wall?

The engineer recommended a 10-foot horizontal setback from the wall before starting any structures to avoid additional stress on the wall.

Why is the compaction of backfill limited to 60-70 percent?

Limiting compaction reduces the lateral load against the wall, preventing pre-stressing before it needs to support the soil.

What are the consequences of improperly directing water flow from the property?

If water flow is disturbed and directed onto a neighbor's property, it can lead to liability issues for damage or harm caused by the redirected water.